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3 years ago

What is the value of the function y=2x+3 when x = –1?

Mathematics

2 answers:

elixir [45]3 years ago

6 0

Y = 2x + 3
y = 2(-1) + 3
y = -2 + 3
y = 1

Answer: 1 or D

mojhsa [17]3 years ago

3 0

$y(-1)=2\cdot(-1)+3=-2+3=1$

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Use the identity (x+y)(x−y)=x2−y2 to find the difference of two numbers if the sum of the numbers is 12 and the difference of th

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Answer:

The difference of two numbers using identity $(x+y)(x-y)=x^2-y^2$ is 4.

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Given: The sum of the numbers is 12 and the difference of the squares of the numbers is 48.

To find the difference of two numbers using identity $(x+y)(x-y)=x^2-y^2$

Let the two numbers be a and b, then

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that is a + b = 12 .........(1)

Also, given the difference of the squares of the numbers is 48.

that is $a^2-b^2=48$ ..........(2)

Using given identity $(x+y)(x-y)=x^2-y^2$

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Substitute the known values, we have,

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Thus, the difference of two numbers using identity $(x+y)(x-y)=x^2-y^2$ is 4.

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4 years ago

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The marked price of an article is Rs 400. If 5% discount is allowed, how much should

kow [346]

Answer:

Rs.380

Step-by-step explanation:

Given data

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3 years ago

What is the slope of the line shown below? PLEASE HELP

NikAS [45]

Answer:

C. 2

Step-by-step explanation:

The grid markings are the same distance apart in the x- and y-directions, so a line with slope 1 will make a 45° angle with the x-axis. Your line is steeper than that, so has a slope more than 1.

Your line goes up to the right, so its slope is positive.

The only answer choice that is a positive number more than 1 is ...

... C. 2

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The slope is computed as the ratio of rise (vertical change) to run (horizontal change). The two marked points tell you the vertical change is from y=-4 to y=6, a change of 6-(-4) = 10. The horizontal change is from x=1 to x=6, a change of 6-1 = 5.

Then the ratio of rise to run is 10/5 = 2. This matches answer C.

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